<template>
	<view class="qiun-columns">
		<view class="qiun-bg-white qiun-title-bar qiun-common-mt" >
			<view class="qiun-title-dot-light">柱状图</view>
		</view>
		<view class="qiun-charts">
			<!--#ifdef MP-ALIPAY -->
			<canvas canvas-id="canvasColumn" id="canvasColumn" class="charts" :style="{'width':cWidth*pixelRatio+'px','height':cHeight*pixelRatio+'px', 'transform': 'scale('+(1/pixelRatio)+')','margin-left':-cWidth*(pixelRatio-1)/2+'px','margin-top':-cHeight*(pixelRatio-1)/2+'px'}"></canvas>
			<!--#endif-->
			<!--#ifndef MP-ALIPAY -->
			<canvas canvas-id="canvasColumn" id="canvasColumn" class="charts"></canvas>
			<!--#endif-->
		</view>
	</view>
</template>

<script>
	import uCharts from '../../js_sdk/u-charts/u-charts/u-charts.js';
	var _self;
	var canvaColumn=null;
	export default {
		data() {
			return {
				cWidth:'',
				cHeight:'',
				pixelRatio:1,
				serverData:''
			}
		},
		onLoad() {
			_self = this;
			//#ifdef MP-ALIPAY
			uni.getSystemInfo({
				success: function (res) {
					if(res.pixelRatio>1){
						//正常这里给2就行，如果pixelRatio=3性能会降低一点
						//_self.pixelRatio =res.pixelRatio;
						_self.pixelRatio =2;
					}
				}
			});
			//#endif
			this.cWidth=uni.upx2px(750);
			this.cHeight=uni.upx2px(500);
			this.getServerData();
		},
		methods: {
			getServerData(){
				uni.request({
					url: 'https://www.easy-mock.com/mock/5cc586b64fc5576cba3d647b/uni-wx-charts/chartsdata2',
					data:{
					},
					success: function(res) {
						console.log(res.data.data)
						//下面这个根据需要保存后台数据，我是为了模拟更新柱状图，所以存下来了
						_self.serverData=res.data.data;
						let Column={categories:[],series:[]};
						//这里我后台返回的是数组，所以用等于，如果您后台返回的是单条数据，需要push进去
						Column.categories=res.data.data.Column.categories;
						//这里的series数据是后台做好的，如果您的数据没有和前面我注释掉的格式一样，请自行拼接数据
						Column.series=res.data.data.Column.series;
						_self.showColumn("canvasColumn",Column);
					},
					fail: () => {
						console.log("网络错误，小程序端请检查合法域名");
					},
				});
			},
			showColumn(canvasId,chartData){
				canvaColumn=new uCharts({
					$this:_self,
					canvasId: canvasId,
					type: 'column',
					legend:true,
					fontSize:11,
					background:'#FFFFFF',
					pixelRatio:_self.pixelRatio,
					animation: true,
					categories: chartData.categories,
					series: chartData.series,
					xAxis: {
						disableGrid:true,
					},
					yAxis: {
					},
					dataLabel: true,
					width: _self.cWidth*_self.pixelRatio,
					height: _self.cHeight*_self.pixelRatio,
					extra: {
						column: {
						  width: _self.cWidth*_self.pixelRatio*0.45/chartData.categories.length
						}
					  }
				});
			},
			changeData(){
				canvaColumn.updateData({
					series: _self.serverData.ColumnB.series,
					categories: _self.serverData.ColumnB.categories
				});
			}
		}
	}
</script>

<style>
page{background:#F2F2F2;width: 750upx;overflow-x: hidden;}
.qiun-padding{padding:2%; width:96%;}
.qiun-wrap{display:flex; flex-wrap:wrap;}
.qiun-rows{display:flex; flex-direction:row !important;}
.qiun-columns{display:flex; flex-direction:column !important;}
.qiun-common-mt{margin-top:10upx;}
.qiun-bg-white{background:#FFFFFF;}
.qiun-title-bar{width:96%; padding:10upx 2%; flex-wrap:nowrap;}
.qiun-title-dot-light{border-left: 10upx solid #0ea391; padding-left: 10upx; font-size: 32upx;color: #000000}
/* 通用样式 */
.qiun-charts{width: 750upx; height:500upx;background-color: #FFFFFF;}
.charts{width: 750upx; height:500upx;background-color: #FFFFFF;}
</style>